Linux Today: Linux News On Internet Time.
Search Linux Today
Linux News Sections:  Developer -  High Performance -  Infrastructure -  IT Management -  Security -  Storage -
Linux Today Navigation
LT Home
Contribute
Contribute
Link to Us
Linux Jobs


Top White Papers

More on LinuxToday


SuSE Security Announcement: sudo

Jan 14, 2002, 21:58 (0 Talkback[s])

                        SuSE Security Announcement

        Package:                sudo
        Announcement-ID:        SuSE-SA:2002:002
        Date:                   Mon Jan 14 13:00:00 CET 2002
        Affected SuSE versions: 7.0, 7.1, 7.2, 7.3
        Vulnerability Type:     local privilege escalation
        Severity (1-10):        5
        SuSE default package:   yes
        Other affected systems: all recent sudo installations

    Content of this advisory:
        1) security vulnerability resolved: Sendmail invocation as root.
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds
        3) standard appendix (further information)

____________________________________________________________________________

1)  problem description, brief discussion, solution, upgrade information

    The SuSE Security Team discovered a bug in the sudo program which is
    installed setuid to root. Attackers may trick "sudo" to log failed sudo
    invocations executing the sendmail program with root-privileges and not
    completely cleaned environment.
    Depending on the installed mail-package this may enable attackers to
    execute code as root. This is the case for at least the postfix mailer.
    Other mailers may be exploited in a similar way.
    This bug has been fixed by having "sudo" invoke the sendmail command with
    user-privileges instead.
    Please update your sudo package regardless of the mail-packages you are
    using. As a temporary workaround you may remove the s-bit from sudo with
    the "chmod -s `which sudo`" command, which will disable the sudo
    functionality.

    Please download the update package for your distribution and verify its
    integrity by the methods listed in section 3) of this announcement.
    Then, install the package using the command "rpm -Fhv file.rpm" to apply
    the update.

    i386 Intel Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/ap1/sudo-1.6.3p7-71.i386.rpm
      b98f00f761274530bfad3486253bed53
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/sudo-1.6.3p7-71.src.rpm
      d046509163e1fc6d4143a8db1c2283d2

    SuSE-7.2
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/ap1/sudo-1.6.3p6-86.i386.rpm
      ee01b7b2ba2e73376eb3c358ccb5b768
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/sudo-1.6.3p6-86.src.rpm
      e8cbaa81d9a806169f0c235ed6bc5d6a

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/ap1/sudo-1.6.3p6-85.i386.rpm
      7ba4ae9fb72348e0d1909c9ea79be5e0
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/sudo-1.6.3p6-85.src.rpm
      a10b4ecae46aaff271f59c7dd726d8d0

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/i386/update/7.0/ap1/sudo-1.6.3p6-85.i386.rpm
      345a8e541b66d5016b939560a525d47c
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/sudo-1.6.3p6-85.src.rpm
      58afdb9b1e6c9e19440ee4047fff1105


    Sparc Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/ap1/sudo-1.6.3p7-26.sparc.rpm
      94139dd96c9be67d4e41d38abee95434
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/sudo-1.6.3p7-26.src.rpm
      b5f16c705cdcf85754037296b8847b20

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/ap1/sudo-1.6.3p6-32.sparc.rpm
      915313678145418569c54332760f989a
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/sudo-1.6.3p6-32.src.rpm
      2fd809a5f53992aa23c732d9466e274a

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/sparc/update/7.0/ap1/sudo-1.6.3p6-33.sparc.rpm
      0c1dce308b37b31ea943369ba23e3dab
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/sudo-1.6.3p6-33.src.rpm
      da4786d3e8798e6c31d4eea338e9cd93


    AXP Alpha Platform:

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/ap1/sudo-1.6.3p6-36.alpha.rpm
      eb020b7e212e0d9cb85578a1b49e3529
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/sudo-1.6.3p6-36.src.rpm
      fb2652e480282dfecbbb7e6db8ec7bec

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/axp/update/7.0/ap1/sudo-1.6.3p6-37.alpha.rpm
      35b6ea7ebac976d8b65f9f09b574e107
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/sudo-1.6.3p6-37.src.rpm
      0ac6c3001d727f3774a57cc76eb7d4c1


    Power PC Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/ap1/sudo-1.6.3p7-51.ppc.rpm
      3ff70447a81e3f4c88b44af2445d4f6d
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/sudo-1.6.3p7-51.src.rpm
      f71b62019ea2f49e0202f74033f07496

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/ap1/sudo-1.6.3p6-42.ppc.rpm
      3bef306a5a8b782fdda0bdd77758b290
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/sudo-1.6.3p6-42.src.rpm
      d9475c12754ae3c87cac72484dc90bbc

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/ppc/update/7.0/ap1/sudo-1.6.3p6-41.ppc.rpm
      54d98aa831bab75529731d0789f01cbd
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/sudo-1.6.3p6-41.src.rpm
      c61d3c629eefaf0eb041a630414d6580


____________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

    - stunnel
    A format string error in the stunnel ssl wrapper was reported on
    bugtraq in December 2001. SuSE Linux 7.2 and 7.3 as well as SLES7
    contain the stunnel package in Version 3.14, which should be
    vulnerable to the format string bug according to the reports on
    bugtraq. However, the responsible portion of code does not expose the
    format string problem with calls to fdprintf(). Therefore, SuSE
    stunnel packages are not vulnerable to the security problem.

    - thttpd
    The thttpd daemon contained several off-by-one overflows. Due to internal
    organization of the variables affected by these overflows, they seem
    not exploitable. However, these bugs have been fixed. Please update to
    the newest thttpd packages.

    - pine
    The popular mail client "pine" was found vulnerable to an attack where
    shell metacharacters inside an URL could be used to execute arbitrary
    commands if pine passes the URL to an external viewer on the
    commandline. The pine packages on SuSE products are not vulnerable to
    this weakness because they contain a patch that works around this
    problem since it is not new.


____________________________________________________________________________

3)  standard appendix: authenticity verification, additional information

  - Package authenticity verification:

    SuSE update packages are available on many mirror ftp servers all over
    the world. While this service is being considered valuable and important
    to the free and open source software community, many users wish to be
    sure about the origin of the package and its content before installing
    the package. There are two verification methods that can be used
    independently from each other to prove the authenticity of a downloaded
    file or rpm package:
    1) md5sums as provided in the (cryptographically signed) announcement.
    2) using the internal gpg signatures of the rpm package.

    1) execute the command
        md5sum <name-of-the-file.rpm>
       after you downloaded the file from a SuSE ftp server or its mirrors.
       Then, compare the resulting md5sum with the one that is listed in the
       announcement. Since the announcement containing the checksums is
       cryptographically signed (usually using the key security@suse.de),
       the checksums show proof of the authenticity of the package.
       We disrecommend to subscribe to security lists which cause the
       email message containing the announcement to be modified so that
       the signature does not match after transport through the mailing
       list software.
       Downsides: You must be able to verify the authenticity of the
       announcement in the first place. If RPM packages are being rebuilt
       and a new version of a package is published on the ftp server, all
       md5 sums for the files are useless.

    2) rpm package signatures provide an easy way to verify the authenticity
       of an rpm package. Use the command
        rpm -v --checksig <file.rpm>
       to verify the signature of the package, where <file.rpm> is the
       filename of the rpm package that you have downloaded. Of course,
       package authenticity verification can only target an uninstalled rpm
       package file.
       Prerequisites:
        a) gpg is installed
        b) The package is signed using a certain key. The public part of this
           key must be installed by the gpg program in the directory
           ~/.gnupg/ under the user's home directory who performs the
           signature verification (usually root). You can import the key
           that is used by SuSE in rpm packages for SuSE Linux by saving
           this announcement to a file ("announcement.txt") and
           running the command (do "su -" to be root):
            gpg --batch; gpg < announcement.txt | gpg --import
           SuSE Linux distributions version 7.1 and thereafter install the
           key "build@suse.de" upon installation or upgrade, provided that
           the package gpg is installed. The file containing the public key
           is placed at the toplevel directory of the first CD (pubring.gpg)
           and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de .


  - SuSE runs two security mailing lists to which any interested party may
    subscribe:

    suse-security@suse.com
        -   general/linux/SuSE security discussion.
            All SuSE security announcements are sent to this list.
            To subscribe, send an email to
                suse-security-subscribe@suse.com.

    suse-security-announce@suse.com
        -   SuSE's announce-only mailing list.
            Only SuSE's security annoucements are sent to this list.
            To subscribe, send an email to
                suse-security-announce-subscribe@suse.com.

    For general information or the frequently asked questions (faq)
    send mail to:
        suse-security-info@suse.com or
        suse-security-faq@suse.com respectively.

    =====================================================================
    SuSE's security contact is security@suse.com or security@suse.de.
    The security@suse.de public key is listed below.
    =====================================================================
____________________________________________________________________________

    The information in this advisory may be distributed or reproduced,
    provided that the advisory is not modified in any way. In particular,
    it is desired that the cleartext signature shows proof of the
    authenticity of the text.
    SuSE GmbH makes no warranties of any kind whatsoever with respect
    to the information contained in this security advisory.

Type Bits/KeyID    Date       User ID
pub  2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

- -----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org
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=ojbD
- -----END PGP PUBLIC KEY BLOCK-----